Java后台如何根据路径地址下载文件?

 public static final String HTTp_URL="http:下载链接";
            public static void main(String[] args) {
                    Dol();
            }
                public static void Dol(){
                    BufferedInputStream bis=null;
                    BufferedOutputStream bos=null;
            try {
                URL url = new URL(HTTp_URL);
                HttpURLConnection connection =  (HttpURLConnection) url.openConnection();
                connection.setRequestMethod("GET");
                connection.connect();
                InputStream is = connection.getInputStream();
                
                bis = new BufferedInputStream(is);
                
                File file = new File("D:/test/"+HTTp_URL.substring((HTTp_URL.lastIndexOf("/"))));//名字截取 可以省略
                FileOutputStream fos = new FileOutputStream(file);
                bos = new BufferedOutputStream(fos);
                int b = 0;
                byte[] byArr = new byte[1024*4];
                while((b=bis.read(byArr))!=-1){
                    bos.write(byArr, 0, b);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }finally{
                try {
                    if(bis!=null){
                        bis.close();
                    }
                    if(bos!=null){
                        bos.close();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }